*{
    padding: 0;
    margin: 0;
    list-style: none;
}
.box{
    width: 1000px;
    margin: 0 auto;
}
.list{
    width: 600px;
    border: 1px solid #ccc;
}
.list li{
    display: inline-block;
    width: 280px;
    height: 50px;
    line-height: 50px;
}
.list li img{
    width: 40px;
    height: 40px;
    vertical-align: middle;
}
.page span{
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    border: 1px solid #ccc;
}
.page .aa{
    width: 65px;
}
.page .on{
    background-color: aqua;
    color: white;
}